Open AccessSynthesis and characterization of modified γ-Alumina-NaA and γ-Alumina-NaX zeolite composites as methanol dehydration catalysts in synthesis Dimethyl Ether (DME)
Author(s) -
Maria Ulfah,
Silvi Octavia,
Hendra Suherman,
Melia Laniwati,
Igbn Makerthiharta,
Subagjo
Publication year - 2020
Publication title -
iop conference series. materials science and engineering
Language(s) - English
Resource type - Journals
eISSN - 1757-899X
pISSN - 1757-8981
DOI - 10.1088/1757-899x/823/1/012010
Subject(s) - dimethyl ether , zeolite , catalysis , methanol , dehydration , desorption , adsorption , materials science , mesoporous material , acid strength , specific surface area , thermal desorption spectroscopy , dehydration reaction , nuclear chemistry , inorganic chemistry , chemical engineering , chemistry , organic chemistry , biochemistry , engineering
Dimethyl ether (DME) is of great interest due to its wide application. It is currently being demonstrated for use as an alternative diesel fuel or substituting LPG for household. DME production via methanol dehydration reaction is affected by textural properties and catalyst surface acidity. The experimental study of textural properties in addition to surface acidity of both γ–Al 2 O 3 prepared in this study and modified γ–Al 2 O 3 over zeolite A and X mixing were conducted. The catalysts were characterized by N 2 adsorption-desorption, X-Ray diffraction (XRD), and temperature programmed desorption of ammonia (NH 3 -TPD). Referring to N 2 adsorption/desorption isotherm using the Brunauer-Emmerr-Teller (BET) equation, the catalysts were observed possessing high specific surface area (170–279 m 2 g -1 ) and pore diameters of 5.6 – 8.8 nm (mesoporous). The XRD patterns of all catalysts still reveals clear peaks of γ–Al 2 O 3 components. The strength of the acid sites of alumina modified with zeolite A is categorized as medium acid sites, whereas modified by zeolite X varies.